# Electrical Machines

## Direct On Line Starter

Direct On Line Starter method is a common method of starting of Cage Induction Motor. The motor is connected through a starter across the full supply voltage. The Direct On Line Starter Method figure is shown below. It consists a coil operated contactor C controlled by start and stop push button as shown in the …

## Maximum Torque Condition of an Induction Motor

In the article named Torque Equation of an Induction motor, we have seen the developed torque and its equation. Here, the Maximum Torque Condition of an induction motor is discussed. The torque produced in the induction motor mainly depends on the following three factors. They are the strength of the rotor current; the flux interacts …

## Torque Equation of an Induction Motor

The developed Torque or Induced Torque Equation in a machine is defined as the Torque generated by the electric to mechanical power conversion. The torque is also known as Electromagnetic Torque. This developed torque in the motor differs from the actual torque available at the terminals of the motor, which is almost equal to the friction …

## Working Principle of an Induction Motor

The motor which works on the principle of electromagnetic induction is known as the induction motor. Electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field. The stator and rotor are two essential parts of the motor. The stator is the …

## Slip Speed in an Induction Motor

Definition: The slip in an induction motor is the difference between the main flux speed and their rotor speed. The symbol S represents the slip. It is expressed by the percentage of synchronous speed. Mathematically, it is written as, The value of slip at full load varies from 6% in the case of a small …

## Construction of Induction Motor

The three-phase induction motor is a preferable type of motor. It is mostly used in industrial drives because it is very reasonable and vigorous, economical and reliable. It is also called asynchronous motor because it does not run at a synchronous speed. The induction motor requires very little maintenance and also it has high overloading …

## Induction Motor

Induction Motor or machines are also called as Asynchronous Machine. The word Asynchronous means that the machine never runs at synchronous speed. Induction motors are mainly of two types. It can be single-phase or three-phase induction motors. A Single-phase induction motor is usually built in small size (up to 3 H.P). The three-phase induction motors …

## Two Reaction Theory – Salient Pole Synchronous Machine

Two Reaction Theory was proposed by Andre Blondel. The theory proposes to resolve the given armature MMFs into two mutually perpendicular components, with one located along the axis of the rotor of the salient pole. It is known as the direct axis or d axis component. The other component is located perpendicular to the axis …

## Power Flow Diagram and Losses of Induction Motor

Power Flow Diagram of Induction Motor explains the input given to the motor, the losses occurring, and the output of the motor. The input power given to an induction motor is in the form of three-phase voltage and currents. The Power Flow Diagram of an Induction Motor is shown below: The power flow is given …

## Armature Reaction in a Synchronous Machine

The effect of Armature (stator) flux on the flux produced by the rotor field poles is called Armature Reaction. When the current flows through the armature winding of the alternator, a flux is produced by the resulting MMF. This armature flux reacts with the main pole flux, causing the resultant flux to become either less …